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vol2. DNS のやりとりをwiresharkで覗いてみる

Last updated at Posted at 2024-01-09

DNSのながれ

とてもシンプル。

DNSクライアントは、DNSサーバーにQueryを投げる。
Queryは"www.yahoo.co.jp"といったURL。

DNSサーバーは、DNSクライアントにAnswerと返す。
Answerは"182.22.31.252"といったIPアドレス。

Ipv4とIpv6version がある。(Type field で識別)

Wireshark Screen Shot

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DNSサーバーへの問い合わせコマンド

@を指定することで、DNSサーバーを指定することができる。

$dig www.yahoo.co.jp @8.8.8.8

; <<>> DiG 9.16.1-Ubuntu <<>> www.yahoo.co.jp @8.8.8.8
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 43848
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;www.yahoo.co.jp.               IN      A

;; ANSWER SECTION:
www.yahoo.co.jp.        900     IN      CNAME   edge12.g.yimg.jp.
edge12.g.yimg.jp.       24      IN      A       183.79.249.252

;; Query time: 173 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Tue Jan 09 14:31:56 EST 2024
;; MSG SIZE  rcvd: 88
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